Optional service dependencies only

[Jaroslav Tulach]

Hello Paul,
I smell a little misunderstanding. When I titled the message "optinal service dependencies only" I really ment it!

If you want to get rid of the NP-Complete problem, remove "requires service xyz" concept and allow only "requires service optional xyz". In your algorithm it would be equal to commenting out call to "ensureServicesPresent();" unless I am mistaken.

Would you accept that?
-jt